This circuit with two HT2030s powers 6 LEDs in a decorative flashing system. The circuit is from Electronics Now magazine, December 1997. The LEDs are fed in sequence.
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...
This oscillator generates a 1 kHz signal, using an old germanium PNP transistor. The circuit was...
Found in an Elektor from the 90s, this circuit is suitable for viewing audio signals on an...